<script setup lang="ts">
import { login, register } from '@/services/user'
import { useUserStore } from '@/stores'
import { User, Lock } from '@element-plus/icons-vue'
import {
  ElMessage,
  type FormInstance,
  type FormItemRule,
  type FormRules
} from 'element-plus'
import { ref } from 'vue'
import { useRouter } from 'vue-router'
//控制注册与登录表单的显示， 默认显示注册
const isRegister = ref(false)

// 注册
type RegisterData = {
  username: string
  password: string
  rePassword: string
}

const registerData = ref<RegisterData>({
  username: '',
  password: '',
  rePassword: ''
})
//自定义确认密码的校验函数
const rePasswordValid = (rule: any, value: any, callback: any) => {
  // 注意 自定义的validator验证方式需要调用callback。
  // 验证失败 callabck(new Error('')). 验证成功 callback()
  if (value == null || value === '') {
    return callback(new Error('请再次确认密码'))
  } else if (registerData.value.password !== value) {
    return callback(new Error('两次输入密码不一致'))
  } else {
    return callback()
  }
}
const username: FormItemRule[] = [
  { required: true, message: '请输入用户名', trigger: 'blur' },
  { min: 5, max: 16, message: '用户名的长度必须为5~16位', trigger: 'blur' }
]
const password: FormItemRule[] = [
  { required: true, message: '请输入密码', trigger: 'blur' },
  { min: 5, max: 16, message: '密码长度必须为5~16位', trigger: 'blur' }
]
const rePassword: FormItemRule[] = [
  { validator: rePasswordValid, trigger: 'blur' }
]
const rules = ref<FormRules<RegisterData>>({
  username,
  password,
  rePassword
})
const formRef = ref<FormInstance>()
const submitRegister = async () => {
  // 校验
  if (!formRef.value) return
  await formRef.value.validate()
  // 发请求
  await register(registerData.value.username, registerData.value.password)
  // 请求成功
  ElMessage.success('注册成功')
  // 切换到登录
  isRegister.value = false
}

// 登录
const loginData = ref<Omit<RegisterData, 'rePassword'> & { checked: boolean }>({
  username: 'lxx666',
  password: '123456',
  checked: false
})
const router = useRouter()
const store = useUserStore()
const submitLogin = async () => {
  // 校验
  if (!formRef.value) return
  await formRef.value.validate()
  if (!loginData.value.checked) return ElMessage.warning('请勾选协议')
  // 发请求
  const res = await login(loginData.value.username, loginData.value.password)
  // 请求成功
  // token存pinia
  store.setToken(res.data)
  ElMessage.success('登录成功')
  // 跳转到首页
  router.push('/')
}
</script>

<template>
  <el-row class="login-page">
    <el-col :span="12" class="bg"></el-col>
    <el-col :span="6" :offset="3" class="form">
      <!-- 注册表单 -->
      <el-form
        :rules="rules"
        :model="registerData"
        ref="formRef"
        size="large"
        autocomplete="off"
        v-if="isRegister"
      >
        <el-form-item>
          <h1>注册</h1>
        </el-form-item>
        <el-form-item prop="username">
          <el-input
            v-model="registerData.username"
            :prefix-icon="User"
            placeholder="请输入用户名"
          ></el-input>
        </el-form-item>
        <el-form-item prop="password">
          <el-input
            v-model="registerData.password"
            :prefix-icon="Lock"
            type="password"
            placeholder="请输入密码"
          ></el-input>
        </el-form-item>
        <el-form-item prop="rePassword">
          <el-input
            v-model="registerData.rePassword"
            :prefix-icon="Lock"
            type="password"
            placeholder="请输入再次密码"
          ></el-input>
        </el-form-item>
        <!-- 注册按钮 -->
        <el-form-item>
          <el-button
            @click="submitRegister"
            class="button"
            type="primary"
            auto-insert-space
          >
            注册
          </el-button>
        </el-form-item>
        <el-form-item class="flex">
          <el-link type="info" :underline="false" @click="isRegister = false">
            ← 返回
          </el-link>
        </el-form-item>
      </el-form>
      <!-- 登录表单 -->
      <el-form
        :rules="rules"
        :model="loginData"
        ref="formRef"
        size="large"
        autocomplete="off"
        v-else
      >
        <el-form-item>
          <h1>登录</h1>
        </el-form-item>
        <el-form-item prop="username">
          <el-input
            v-model="loginData.username"
            :prefix-icon="User"
            placeholder="请输入用户名"
          ></el-input>
        </el-form-item>
        <el-form-item prop="password">
          <el-input
            v-model="loginData.password"
            name="password"
            :prefix-icon="Lock"
            type="password"
            placeholder="请输入密码"
          ></el-input>
        </el-form-item>
        <el-form-item class="flex">
          <div class="flex">
            <el-checkbox v-model="loginData.checked">记住我</el-checkbox>
            <el-link type="primary" :underline="false">忘记密码？</el-link>
          </div>
        </el-form-item>
        <!-- 登录按钮 -->
        <el-form-item>
          <el-button
            @click="submitLogin"
            class="button"
            type="primary"
            auto-insert-space
          >
            登录
          </el-button>
        </el-form-item>
        <el-form-item class="flex">
          <el-link type="info" :underline="false" @click="isRegister = true">
            注册 →
          </el-link>
        </el-form-item>
      </el-form>
    </el-col>
  </el-row>
</template>

<style lang="scss" scoped>
/* 样式 */
.login-page {
  height: 100vh;
  background-color: #fff;

  .bg {
    background:
      url('@/assets/logo2.png') no-repeat 60% center / 240px auto,
      url('@/assets/login_bg.jpg') no-repeat center / cover;
    border-radius: 0 20px 20px 0;
  }

  .form {
    display: flex;
    flex-direction: column;
    justify-content: center;
    user-select: none;

    .title {
      margin: 0 auto;
    }

    .button {
      width: 100%;
    }

    .flex {
      width: 100%;
      display: flex;
      justify-content: space-between;
    }
  }
}
</style>
